Stud extractor tool



W. F. DREYER.

STUD EXTRACTOR TOOLV Filed March 18 1946 Feb. M9 E950 'm|mmllmimmmultim lg/ j I7 l /0 7 /4 f V20 /Z z3 4 lr- E I Patented F eb. 14, 1950 UNITED STATES PATENT ori-ICE STUD EXTRACTOR TOOL William F. Dreyer,v Miami, Fla.` Application March 18, 1946, Serial No. 655,271

2 Claims. (Cl. 81-53) This invention relates to stud extractors, and particularly to a tool of this character intended and adapted to be employed in gripping and holding stud bolts, stay bolts, and other screw threaded fasteners that are headless, so that such bolts or screw threaded members can be tightened into place and can be extracted.

An object of my invention is to provide a tool which is adaptable to be used with and upon screw threaded stud and bolt ends and the like of dilierent sizes, or with different standards and pitches of threads.

Another object is to so construct the tool that aplurality of collet or clamping pieces, for different sizes of studs and for different pitches and standards of threads can be readily interchangeably fitted and employed.

Still another object is to provide a single tightening and manipulating screw which can be readily operated to tighten the collet or clamping piece upon a screw threaded stud or` bolt end, and to loosen the same therefrom, and which at the same time can be manipulated to remove a collet or clamping piece and to adjust another clamping piece into place when it is desired to change to different sizes or diameters, or to substitute a collet or clamping piece having a diiierent pitch or standard of thread.

With the above and other objects in view, some of which will be apparent to those skilled in the art, and others of which are inherent in the use and operation of my improved tool, this invention includes certain novel features of construction and combinations and arrangements of parts which will be hereafter set forth in connection with the drawing, and then pointed out in the claims.

In the drawing:

Figure 1 is a view in side elevation illustrating an embodiment of my invention.

Fig. 2 is a longitudinal sectional view o the showing in Figure 1.

Fig. 3 is a view similar to Fig. 2 illustrating the tool clamped upon the threaded end of a stud or bolt.

Fig. 4 is a, transverse sectional view substantially on line 4-4 of Fig. 3.

Fig. 5 is a view in side elevation of the casing and tightening screw.

Fig. 6 is a view in end elevation of the tool.

Fig. '7 is a view in side elevation showing one of the collet or clamping pieces.

Fig. 8 is a view in end elevation of the showing in Fig. 5.

In the adaptation as shown in the several gures of the drawing, the outer sleeve or casing I' is provided with an externally cylindrically middle portion 2 and is gradually ared out and enlarged toward one end, as at 3, the casing being provided with a. hexagonal or other poly-- gonal or tool receiving portion 4 at its other end. This outer sleeve or casing or body member I has an axial bore 5 extending thereinto from the enlarged end, and terminating in a shoulder 6, and an axial bore l, of lesser diameter, extends from the shoulder 6 through the end of the polygv onal portion 4. At the open end o the bore 5, a taper is provided, as at 8, thus giving a flared out tapered throat or seat portion. f This outer sleeve or casing or body can be readily and cheaply made out of tool steel or other desired metal, by lathe and other ordinary shop or factory operations, and in order that the tool may be more readily grasped and held and manipulated, lt is perhaps desirable that the cylindrical portion 2 be provided with knurling, as at 9.

A tightening and adjusting screw I0 has a cylindrical bearing portion II received through the opening I for free rotational movement, and a flange I2 is provided on this adjusting end tightening screw II) in position to bear against the shoulder 6 so that the threaded end of the tightening screw l0 is disposed to extend substantially centrally or axially within the bore 5 of the outer sleeve or casing or body. After placement of the screw I0 with the bearing portion Il thereof extending through the bearing opening l, a polygonal head I3 is secured on the outer end. This head I3 is rigidly mounted in any desired and well known manner, and -is made of hexagonal or other polygonal or distinctive shape that will permit application oi a wrench or other tool for rotating the screw Ill; and, it may be further desirable to provide a shoulder ring I'II at the inner extremity of the head I3 so that a free rotating thrust bearing is provided on the outer face of the portion 4 of the casing, and at the same time a wrench or tool applied to the headv I3 will be held from contact with any portion of the outer sleeve or casing.

A collet or clamping piece I5 has a cylindrical body portion of shape and size to t and slide freely within the bore 5, and at one end this member I5 has an enlarged tapered portion |6 corresponding in its angle of inclination sube stantially with the angle of the enlarged taperedl bore of the outer sleeve or casing Iat 8. The collet or clamping piece I5 has an axial bore Il extending thereinto from the enlarged end, and is provided with an internally screw threaded opening I8 at its other end to receive Aand fit. the screw threaded end of the tightening bolt- III. The bore I1 is of an internal diameter cor-'- responding with the diameter of the stud or bolt I9, yand is provided with internal screw threads 20 to t the screw threads 2l of the stud "or bolt end I9, without too snug fitting. The collet or clamping piece has a plurality ofequi-distantly spaced cuts or splits 22 extending substantially radially through the wall thereof from the outer end of the tapered portion I'G, and these slots or splits 22 thus provide contractible ,resiliency for Ythe tapered portion IG and the ,portions of the collet or clamping piece having the threads 20 therein.

The collets or clamping pieces l5 can be made up or supplied to t and be used upon threaded stud or bolt ends of diierent diameters, :and :of different shapes, and with threads of .different pitches and different standards; and,'theseparts are each made to be interchangeably fltted Aand used with the outer sleeve or case l and the tightening screw l E), as these parts are assembled.

Assuming a collet or clamping piece to be ttedin place as shown'inFigsl 'and 2, the 'tightening fscrew "i kis rotated suiliciently to draw or move the collet or Yclamping piece into a retracted `position `where the Atapered portion -IB thereof Ybears upon and against the taperedllwall 8 of the outer sleeve or casing to lhold thecollet frictionally against rotational movement, but without contracting the split -portion thereof. Since the threadzll is cut or formed 'for a more or`less`loose nt on the "threaded end 2l of the stud or bolt [9, the rtool-can then be grasped by theknurled portion@ andfcan be rotated to turn the Ithreaded -portion 2U von'to the threads 21 By then applying a wrench or tool to the'head I3, the tightening screw lll can be manipulated Yto draw the `shoulder lI6 `of the'collet I5 clampingly against 'the 'tapered'throa't or `shoulder 8 of the outer sleeve creasing, thereby contracting the split portion o'f the Ycollet or clamping piece so that the threads 'thereof lock upon 'the threaded end2l. When-the tool is thus locked in place, a wrench-or other Vtool '23 can be applied to the portion ll of the casing, after themanner illustrated inFig. 3, and the tool can "then berotated to ltighten. the stud l'g into place o1' to extract Vthe same, or 'to otherwise manipulate androtate and handle the stud or bolt having'the tool clamped upon the1threaded end thereof.

When vitis vdesired to use a collet or clamping piece vhaving a diierent diameter of opening or a ydifferent pitch yor standard of thread or a different shape, the .tightening screw 'Ill is rotated to force the coll'etor clamping piece 'I5 out of the bore-5 ofthe outer sleeve or casing, and as the threaded :portion of-screw l'll leaves the threaded opening |38, the collet can be freely removed, and a newor different, or 'the same collet, can 'be-readily replaced. "While'the-parts are'accurately sized, it

may'rbe found desirable "t'o'redu'ce :thelend tof the tightening screw 4D, as at :24, A.to thus 'insure :easy entry of this threaded end into the threaded opening lill of each and every 'collet or `clamping piece as vfitted 'into'.place.

Qnly'dihe'manipulaticn of .the parts 'to accomplish tighteningof the .collet upon the vthreaded portionl :has been described, but 'it will be apparent that 4when the tightening :screw YIll is turned to `move the Abody :of the collet l5 outwardlywithin the bore 5,.tl'recontractingcontact of fthe 'tapered outer -wall :I6 of the collet with the aredpthroatxs 'of the vouter sleeve :or case will be released sothat the split portionof lthe collet will expand to release ithe grip on 'the 'threaded end ZI 'and thus epermitthie tool to [be turned `off and disengaged from this threaded end.

While I have herein 4shown and described specific embodiments Vof vmy invention and have suggested ,only fpossible modifications, Vit `"will vbe appreciated that many changes Aand variations can be made in the form and arrangements and assembly of the parts to suit diiferent conditions and purposes of use, without departing from the spirit and scope of my invention. 5 l claim:

1. A stud extracting tool comprising an outer .sleeve having an axial cylindrical bore extending "thereinto from one end and enlarged to provide an outwardly flared smooth surfaced conical opening atsaid end, said outer sleeve having a bearing opening extending axially through its opposite 4end, a tightening screw swiveled within the bearing opening against endwise movement with its threaded end extending into the bore and with a manipulating portion extending beyond the end of ftheouterlsleeve, vand a substantially cylindrical smooth surfaced .collet slidably and 'rotatably -insertable within the bore of the outer sleeve -provided with ra .threaded openingto receive the threaded end ofthe tighteningbolt and lhaving an internal bore threaded to receive the threaded end of a stud, said 'collet having a smooth surfaced outwardly ared'externa'l portion :and 'being longitudinally` split at the internally'threaded flared end, and said collet being freely rotatable as initially inserted within the bore and being locked against rotation solely bybinding of yits rtapered Vouter `wall against fthe tapered inner wall of the sleeve as the colletis drawn thereinto by thetightening screw.

L2. A stud extracting tool comprising an vouter sleeve having a middle substantially cylindrical portion with a polygonal portion at one end and an outwardly flared long conical portion at the' otherend, said outer sleeve having a central cylindrical bore `entering from the flared end and provided with a flared long conical enlargement at the opening'end, said'outer sleeve also having `a bearing opening-extending axially Ithrough'the polygonal manipulating portion, a tightening screw swiveled in said kbearing vopening against endwise movement vwith itsthreaded end extending 'into the bore, a `polygonal'manipulating end on said tightening bolt kextending outwardly beyond 'the manipulating portion of the outer sleeve, and a collet of generally cylindrical form slidably and rotatably finsertable Within the bore of the outer sleeve lhaving its outer end enlarged and flared conically outwardly, said collet having the flared end internally screw threaded to receive a threaded end yof a stud and split longitudinally and the collet being provided at its opposite end with an internally screw threaded :opening 'receiving the threaded end of the swiveled tight- V ened screw, and the fcollet being initially rotatable Within'the bore of the outer sleeve and `being locked against rotation solely by binding contact Vbetween 4,the tapered surfaces as the tightening screw draws 'the collet into the outer sleeve.

WUJLIAM DREYER.

REFERENCES CITED The following references are of record in the me of this patent:

UNITED STATES PATENTS 

